yes so as per the question the cotton ball is in the context so we need to know that if the ball of cotton has a greater mass and aerodynamical shape such that the density is quite low and the pressure acting on the ball is less.....,,,,,,

understand it like this:
when any body falls from through air the particles of air collide with it as when throw a ball in water then the particles of water collide with that ball ........similarly assume about air.